Method for converting low-content bisphenol S into high-content bisphenol S

Abstract

The invention relates to a method for converting low-content bisphenol S into high-content bisphenol S. The method comprises the following steps: adding the low-content bisphenol S with the water content of 4-6wt% into a flask, then adding mesitylene into the flask, and after addition, heating for refluxing water removal so as to remove water from the bisphenol S; after water removal, cooling theflask, then sequentially adding an alcohol solvent and a sulfonic acid catalyst into the flask, and continuing a refluxing reaction for 6-8 hours; after the refluxing reaction, sampling for analysis,stopping the reaction when the 4,4'-dihydroxydiphenyl sulfone content reaches 94-95%, and recycling the alcohol solvent under reduced pressure; finally, adding a mixed alcohol solvent of isopropanol and isopentanol into the 4,4'-dihydroxydiphenyl sulfone with the content of 94-95%, and recrystallizing to obtain the high-content bisphenol S with the 4,4'-dihydroxydiphenyl sulfone content as high as99-99.8%. The method has the advantages as follows: by the method, the product utilization rate is increased and the production cost and the environmental protection cost are reduced.

Description

technical field [0001] The invention belongs to the technical field of organic compound synthesis, and in particular relates to a method for converting low-content bisphenol S into high-content bisphenol S. Background technique [0002] Bisphenol S, whose chemical name is 4,4'-dihydroxydiphenyl sulfone, sometimes referred to as BPS, is an important synthetic raw material for pesticides, dyes, auxiliaries, and polymer compounds, and is mainly used for the preparation of heat and pressure-sensitive Color-developing recording materials, color-fixing agents, leather tanning agents, high-temperature dyeing dispersants, color photographic materials, daily-use surfactants and high-efficiency deodorants, etc. In recent years, because bisphenol A is considered as an environmental hormone pollutant, the use of some polymers prepared from bisphenol A is limited. In some occasions, bisphenol S can be used instead of bisphenol A to prepare related polymers, so bisphenol A The market dem...

AI Technical Summary

Problems solved by technology

[0003] After conventional bisphenol S synthesis 4,4 ， -Dihydroxydiphenylsulfone and 2,4 ， - Two kinds of dihydroxydiphenyl sulfone, of which the crude product 4, 4 ， -The content of dihydroxydiphenyl sulfone is generally about 95%, which is purified by recrystallization into 4,4 ， -Dihydroxydiphenyl sulfone content of 95%-99.8% After products of various specifications, during the recrystallization purification process, some low-content recovered products will appear in the crystallization mother liquor, that is, a mixture with a content generally between 60-70%, resulting in The low utilization rate of products will inevitably lead to higher production costs and environmental protection costs